Turbine-blade.



Patented June M1910.

H. H. WAIT, HRBINE BLADE. APPLXOATION, FILED MAR. 19,1910.

.t UNITEDV saperne Arana? irren..

HENRY H. 'WAIT, 0F CHICAGO, ILLINOIS.

TURBINE-BLADE.

To all whom it may concern:

Be it known that I, HENRY H. WAIT, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Turbine-Blades, of which the following is a full,vclear, concise, and exact description.

.This invention relates to the structure and mode of mounting the stationary guide blades and diaphragme of fluid pressure turbines. Its object is to provide ablade of simple construction, which is cheap to manufacture and which can be readily and accu-v rately assembled to provide passages that will guide the fluid so as to nnpinge in a suitable ina-nner upon the usual sets of rotary turbine blades.

A 'further object is to secure, in a simple manner, the outer ends of the'stationary blades to the turbine casing and their inner ends to the stationary diaphragm so that said diaphragm is firmly and securely held in place and will not be displaced by reason of the difference in pressure to which the opposite sides of the diaphragms are subjected.

My invention consists of a turbine blade of concavo-convex cross-section having its exit tip more elongated than its entrance tip and having its opposite ends formed with a root l and a tang adapted, respectively, to fit in a socket in the periphery of the diaphragm disk andin a channel or groove ina support ing ring which surrounds the outer ends of said blades.

Another feature of my invention consists in providing a cover plate for the inner face of the aforementioned grooved ring, said cover plate being provided with perforations to receive the outer taugs of the-blades.V

In the preferred embodiment of my invention the roots of the blades have the crosssection of a circle less a curved segment corresponding to the concave side of said blades; said roots fitting in circular sockets in the periphery of the stationary diaphragm, the space in said circular sockets not occupied by said tangs `being filled by some ductile material.

These and other features of my invention may be more readily understood by reference to the accompanyingl drawings, in which,

Figure l is a fragmentary view in side elevation of a stationary diaphragm, the

specification of Letters Patent. i Application ed March 19, 1910.

Serial No. 550,462.

outer retaining ring and the -interposed blades; Fig. 2 is a radial section between adi joining blades, showing a blade in front elevation; and Fig. 3 is an enlarged view on the broken line 3 3 of F ig. 1.v

Similar characters of reference refer to similar parts throughout the several views.

Patented .rune 14., 1910.

The guide portions l of the turbine blades of my invention are of concave-convex crosssection, the exit tips 2 thereof being more elongated than the entrance tips 3. Said blades at their outer ends are provided with tangs a having straight, parallel sides adapted to be received in an annular chann l 0r groove 5 in the'supportingring 6. The inner face of the supporting ring is covered hy a cover plate 7 which is provided with a series of openings or perforations corresponding' to the cross-sectional contour of the tangs 4, said tangs thus extending through the cover plate 7 into the channel 5. The cover plate 7 thus lies between the body .of the blade l and the retaining ring 6 and serves to cover over those portions of the channel 5 which are not .occupied by the tangs 4.. x

The inner endsv of the blades l are provided With roots 8 which are preferably of a circular cross-section less a convexe.- convex segment at the front surface of the root, the concave surface of said root being. l

a longitudinal prolongation of the concave surface of the body of the blade.

The stationary preferably provided with a rim l0 of. increased axial thickness, said rim having in its periphery sockets ll which are adapted to receive the blade roots 8. After the blade roots are set in place in said sockets' l1, they are -held iirmly secured to the diaphragmby calking in malleable metal in the concavity on the front of the blade root, such calking or filler pieces being indicated at 17.2 in. Fig. 3.

The retaining ring 6 may be secured to the inner surface of the turbine casing 13 in any suitable manner, as for example, it may fit in a channel formed in the casing, as shown in Fig.' 2. The blades 1 being thus securely fastened to the ring 6 at their outer ends and to the diaphragm 9 at their inner ends, said diaphragm is thereby firmly held against displacement and no other support therefor is required. By Y reason of this structure and arrangement the stationary diaphragm or disk. 9 is a series of radial, .circular I claim is:

1. In a. iuid pressure turbine, the combination with e stationery diaphragm, guide blades secured to the periphery ot said diaphragni, said guide blades he'ing' each e tang on its outer end, and a supporting ring having :i channel for receiving said tangs.

2. In a luid pressure turbine, the conibination with a stationary diaphragm, guide blades secured. to the periphery of seid diaphragm, said guide bladesn having each n tang on its outer end, a supporting ring hav* ing' e channel for receiving said teng's, and

a cover plate overlying said channel, said cover plate being provided With perfcrntions through which said tangs extend into said channel.

3. In a fluid pressure turbine, the combination with a stationary diaphragm having a series of radial sockets about its periphery, guide blades having roots secured Within said sockets, and a supporting ring having a channel for receiving the outer ends ot said blades.

4. In n Huid pressure turbine, the combination with n stationary diaphragm having e seriesL of radial sockets of circuler crosssection in its periphery, guide blades having roots of concevoronvex cross-section ittino in said sockets, the convex surface of said roots corresponding to the curvature of the wells of seid soclrets end itting therein, and

senese filler pieces fitting in seid sockets upon the 'concave face of said root.

roots of concavo-convex cross-section iitting in said sockets, the convex surface of said roots corresponding to the curvature of the 'Walls of said sockets and fitting therein, filler pieces tting in. said sockets upon the concave face of seid root, n supporting ring having n channel for receiving the outer ends of said blades, and n cover plete overlying said channel, said cover plate being provided with perforations through which said outer ends of the blades project into said channel.

C. A turbine blade comprising :i suitable guide. portion, n rootor' concavo-convex cross-section, the convex surface of such root being the nrc of a circle and the concave surface thereof being n. longitudinal prolongation of the concave surince of said body portieri of the blade, and n. tang nt the outer end of seid blade having parallel plaine side faces.

in Witness whereof, I hereunto subscribe my naine this seventeenth dey of March, n. n., 191e. f

HENRY H. lWAIT.

1Witnesses Geenen i5. Giro. C. 

